Nissan Pathfinder. Manual — part 238
SYSTEM
BRC-11
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
SYSTEM
System Diagram
INFOID:0000000009177244
System Description
INFOID:0000000009177245
• The system switches fluid pressure of each brake caliper to increase, to hold or to decrease according to
signals from control unit in ABS actuator and electric unit (control unit). This control system is applied to
VDC function, TCS function, ABS function, EBD function and hill start assist function.
• Fail-safe function is available for each function and is activated by each function when system malfunction
occurs.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
VDC function, TCS function, ABS function and EBD function
AWFIA0897GB
Component
Signal description
Yaw rate/side/decel G sensor
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via com-
munication line*
1
:
• Yaw rate signal
• Side G sensor signal
• Decel G sensor signal
ECM
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication:
• Accelerator pedal position signal
• Engine speed signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Target throttle position signal
TCM
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication:
• Shift position signal
BRC-12
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
*1: Communication line between yaw rate/side/decel G sensor and ABS actuator and electric unit (control unit)
VALVE OPERATION (ABS AND EBD)
Each valve is operated and fluid pressure of brake caliper is controlled.
When ordinary brake is applied and ABS is in operation (when pressure increases).
When front RH wheel caliper pressure increases
Steering angle sensor
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Steering angle sensor signal
Combination meter
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication:
• Brake fluid level switch signal
• Parking brake switch signal
Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN
communication:
• ABS warning lamp signal
• Brake warning lamp signal
• VDC warning lamp signal
• VDC OFF indicator lamp
Component
Signal description
JPFIC0159GB
Name
Not activated
When Pressure Increases
Cut valve 1
Power supply is not supplied (open)
Power supply is not supplied (open)
Cut valve 2
Power supply is not supplied (open)
Power supply is not supplied (open)
ABS IN valve
Power supply is not supplied (open)
Power supply is not supplied (open)
ABS OUT valve
Power supply is not supplied (close)
Power supply is not supplied (close)
Each caliper (fluid pressure)
—
Pressure increases
SYSTEM
BRC-13
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At
the same time, pressurized brake fluid is supplied to front RH caliper through ABS IN valve.
When front LH wheel caliper pressure increases
• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the
same time, pressurized brake fluid is supplied to front LH wheel caliper through ABS IN valve.
When rear RH wheel caliper pressure increases
• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the
same time, pressurized brake fluid is supplied to rear RH wheel caliper through ABS IN valve.
When rear LH wheel caliper pressure increases
• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At
the same time, pressurized brake fluid is supplied to rear LH wheel caliper through ABS IN valve.
When ABS operation starts (when pressure holds)
When front RH wheel caliper pressure holds
• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At
the same time, because ABS IN valve and ABS OUT valve are closed, fluid pressure holds.
When front LH wheel caliper pressure holds
• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the
same time, because ABS IN valve and ABS OUT valve are closed, fluid pressure holds.
JPFIC0160GB
Name
Not activated
When pressure holds
Cut valve 1
Power supply is not supplied (open)
Power supply is not supplied (open)
Cut valve 2
Power supply is not supplied (open)
Power supply is not supplied (open)
ABS IN valve
Power supply is not supplied (open)
Power supply is supplied (close)
ABS OUT valve
Power supply is not supplied (close)
Power supply is not supplied (close)
Each caliper (fluid pressure)
—
Pressure holds
BRC-14
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
When rear RH wheel caliper pressure holds
• Motor is activated. Brake fluid is pressurized by pump and is sent to primary line through cut valve 1. At the
same time, because ABS IN valve and ABS OUT valve are closed, fluid pressure holds.
When rear LH wheel caliper pressure holds
• Motor is activated. Brake fluid is pressurized by pump and is sent to secondary line through cut valve 2. At
the same time, because ABS IN valve and ABS OUT valve are closed, fluid pressure holds.
ABS is in operation (when pressure decreases)
When front RH wheel caliper pressure decreases
• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.
When front LH wheel caliper pressure decreases
• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.
When rear RH wheel caliper pressure decreases
• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.
When rear LH wheel caliper pressure decreases
• Being supplied to reservoir through ABS OUT valve, the fluid pressure of brake caliper is decreased.
Component Parts and Function
JPFIC0161GB
Name
Not activated
When pressure decreases
Cut valve 1
Power supply is not supplied (open)
Power supply is not supplied (open)
Cut valve 2
Power supply is not supplied (open)
Power supply is not supplied (open)
ABS IN valve
Power supply is not supplied (open)
Power supply is supplied (close)
ABS OUT valve
Power supply is not supplied (close)
Power supply is supplied (open)
Each caliper (fluid pressure)
—
Pressure decreases
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